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SLA-35 Pre-Amplifier/Attenuator iPhone MP3 level booster

Stereo level and impedance matching amplifier
Volume distortions or volume losses may occur when connecting smartphones, mobile phones, tablet PCs and MP3 players to an amplifier or a mixer. Due to the correct setting of impedance and gain, the SLA-35 is able to provide a better sound.

  • Adjustable attenuation down to 1/10 (-20 dB) or gain up to 10-fold (+20 dB)
  • Impedance switching Hi/Lo
  • RCA and 3.5 mm stereo inputs and outputs
  • Metal housing
  • Supplied with plug-in PSU


Frequency range3-50,000 Hz
Control range 
Control frequencies 
Input signal7 V max.
Input sensitivity-
Input impedance35 kΩ/8.1 kΩ (switch -5.6 dB)
Output signalmax. 4.5 V/1.6 kΩ
Output impedance 
Gain0.1-10 (±20 dB)
continuously adjustable,
additionally -5.6 dB, switchable
Phantom power 
Gate ratio 
Crossover frequency 
High-pass filter 
Low cut 
Transmission ratio 
S/N ratio> 83 dB
Channel separation> 68 dB
THD< 0.03%
Admiss. ambient temp.0-40 °C
Power supplyvia suppl. PSU
Dimensions88 x 37 x 103 mm
Weight450 g
Inputs1 x RCA L/R,
1 x 3.5 mm jack
Outputs1 x RCA L/R,
1 x 3.5 mm jack



SLA-35 Pre-Amplifier/Attenuator iPhone MP3 level booster

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